Matthias II, Duke of Lorraine

Matthias II (c. 1193–1251), son of Frederick II and Agnes of Bar, succeeded his brother Theobald I in 1220. He first yielded Nancy to his brother's widow, but it reverted to the duchy at her death in 1225.

He restored the alliance with the emperors, joining Frederick II on the Sixth Crusade in 1228 and helping crush his son Henry's revolt in 1235.

War with the Count of Bar, who had ravaged his lands in 1230, ended in peace in 1245, and in 1247 he joined the papal party against Frederick. He died on 9 February 1251, leaving a son who became Frederick III.